早产儿，生后7小时出现进行性呼吸困难，青紫和呼吸衰竭，动脉血PaO₂40mmHg，PaCO₂70mmHg，SaO75%，患儿诊断可能是（）

A.新生儿吸入性肺炎

B.新生儿呼吸窘迫综合征

C.新生儿湿肺

D.新生儿窒息

E.新生儿肺膨胀不全

No one was sure exactly__________ he wanted

A．how was it that

B．how it was that

C．what was it that

D．what it was that